These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.97 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/IO-stringy-2.113.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 47 KiB
[ebuild  N     ] dev-perl/MogileFS-Client-1.170.0-r3::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 24 KiB
[ebuild  N     ] dev-perl/MogileFS-Utils-2.300.0-r1::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 40 KiB

Total: 3 packages (3 new), Size of downloads: 111 KiB